Issue Date: July 27, 2015
There’s More To The Story
The Newscripts of May 11 (page 48) noting the auction of the 1927 Nobel Prize in Chemistry medal for $395,000 failed to mention the most interesting fact regarding that award. Heinrich O. Wieland and Adolf O. R. Windaus had the structural connectivity of cholesterol wrong. In 1932, J. D. Bernal published the lattice constants and space groups of six steroids related to vitamin D, which showed that the structural formula for the four-fused-rings system proposed by Wieland and Windaus could not be correct (Nature 1932, DOI: 10.1038/129277a0).
On the basis of Bernal’s work, Wieland and Elisabeth Dane (1932) came up with the correct structure, which was finally confirmed when the X-ray structure of cholesteryl iodide was published by Harry Carlisle and Dorothy Crowfoot (later Hodgkin) in 1945. In a classic paper, Bernal, Crowfoot, and I. Fankuchen (Philos. Trans. A 1940, DOI: 10.1098/rsta.1940.0010) described the crystallography and crystal chemistry of 80 steroids. They reported the cell constants, space groups, optical properties, and crystal morphology of these steroids, as well as analysis of the length, width, and thickness, and relative orientation of the molecular axes to the crystallographic axes.
It is hard to believe that before the availability of digital computers, cholesterol, an asymmetric structure of 28 light atoms—C, O, plus attached hydrogens—was impossible to solve without a heavy atom. Dorothy Crowfoot Hodgkin went on to win the Nobel Prize in Chemistry in 1964 “for her determinations by X-ray techniques of the structures of important biochemical substances,” principally penicillin and vitamin B-12, and much later the structure of insulin.
Jane F. Griffin
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